用阻抗和锁定探测技术探测La2NiMnO6中的顺磁共振
Paramagnetic resonance in La2NiMnO6 probed by impedance and lock-in detection techniques
摘要：
本文报道了在室温下，采用两种无腔方法，在频率为f = 1 ~ 5 GHz的微波磁场中，对双钙钛矿型La_2NiMnO_6的顺磁共振进行了探测。我们使用间接阻抗法，该方法使用射频阻抗分析仪和折叠铜带线圈，频率范围f = 1至2.2 GHz。在这种方法中，当施加直流磁场扫描时，带状线圈的高频电阻呈现尖峰，电抗曲线过零，呈现共振。使用共面波导用于微波激发的基于锁定的宽带设置被用于f = 2至5GHz。从这两种技术获得的谐振场（Hr）随频率和大的光谱g因子（等于2.1284）线性增加，这支持具有强自旋-轨道耦合的Ni 2+阳离子的存在。通过线形分析和解析拟合，得到了材料的初始磁化率和阻尼参数。
英文摘要：
We report the detection of paramagnetic resonance in the double perovskite La2NiMnO6 at room temperature for microwave magnetic fields with frequencies, f = 1 GHz to 5 GHz, using two cavity-less methods. We use an indirect impedance method which makes use of a radio frequency impedance analyzer and a folded copper strip coil for the frequency range f = 1 to 2.2 GHz. In this method, when an applied dc magnetic field is swept, high-frequency resistance of the strip coil exhibits a sharp peak and the reactance curve crosses zero exhibiting resonance. A lock-in based broadband setup using a coplanar waveguide for microwave excitation was used for f = 2 to 5 GHz The resonance fields (Hr) obtained from both the techniques increase linearly with frequency and a large spectroscopic g-factor, equal to 2.1284, which supports the presence of Ni2+ cation with strong spin-orbit coupling. Line shape analysis and analytical fitting were performed to characterize the material in terms of its initial susceptibility and damping parameters.
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